The refills, for a citronella collar, function as advertised. It's too bad the refills don't contain more doses and the price per refill is high, but if you have a barky dog that is not responding to consistent training, using a citronella collar is worth trying.

While our Plott Hound is never likely to be a quiet pet, we had to do something about her hysterical barking at the squirrels in our yard. The Gentle Spray Collar, which dispenses this citronella spray, helps to remind her in a humane way, when she is barking inappropriately. The citronella injects easily into the collar receptacle. When the barking begins, it is dispensed in a gentle puff; she is usually more startled by the "psst" sound than the citronella itself, which also has a distracting scent that is not unpleasant to humans. We will continue to purchase this until her behavior is modified, which will take a while because she is true to her breed -- loveable but stubborn.